diff --git a/pyproject.toml b/pyproject.toml
index 5265ba9..9068613 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires-python=">=3.8"
 name = "lang_agent" 
 version = "0.1"   
 dependencies = [
-    "langchain==1.0",
+    "langchain>=1.0",
     "langchain_community",
     "langchain-openai",
     "langchain_mcp_adapters",